127-Bit Subnet Masks on Point-to-Point Networks

Note: 127-bit subnet masks are supported on ICX 7150, ICX 7250, ICX 7450, ICX 7550, ICX 7650, and ICX 7850 devices running the full Layer 3 image.

To conserve IPv6 address space, a 127-bit subnet mask can be assigned to point-to-point networks. Support for an IPv6 address with a 127-bit subnet mask is described in RFC 6164.

A 127-bit subnet mask uses only two IPv6 addresses: all zero bits and all one bits in the host portion of the IP address. The two IPv6 addresses are usable, and are interpreted as host addresses.

127-bit subnet masks are only supported if IPv6 unicast routing is configured.

In this section:

  1. Assigning a 127-bit subnet mask to an IPv6 address
    To conserve address space, you can assign a 127-bit subnet mask to an IPv6 address.
Parent topic: IPv6 Addressing